C1278 GMC Code - TCS Temporarily Inhibited By PCM
Quick Answer
The C1278 GMC code indicates that the traction control system (TCS) has been temporarily inhibited by the powertrain control module (PCM). Common causes include Faulty TCS control module, Malfunctioning ABS system, Communication error between TCS and PCM. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- C1278 GMC indicates TCS Temporarily Inhibited By PCM.
- Common causes
- Common causes include Faulty TCS control module, Malfunctioning ABS system, Communication error between TCS and PCM.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
Code C1278 GMC Description
The C1278 GMC code indicates that the traction control system (TCS) has been temporarily inhibited by the powertrain control module (PCM). The TCS is a safety feature in vehicles that helps maintain stability and control during acceleration on slippery surfaces or during sudden maneuvers. When the PCM inhibits the TCS, it means that the system is unable to function properly, potentially compromising the vehicle's handling and safety.
Common Causes of C1278 GMC
- Faulty TCS control module
- Malfunctioning ABS system
- Communication error between TCS and PCM
- Defective wheel speed sensors
- Wiring or connection issues in the TCS system
Symptoms of C1278 GMC
- Illumination of the TCS warning light on the dashboard
- Reduced traction on slippery surfaces
- Increased wheel slippage during acceleration
- Difficulty maintaining control during sudden maneuvers
- ABS warning light may also illuminate
How to Fix C1278 GMC
- Diagnose the specific cause of the TCS inhibition using a diagnostic scanner to retrieve fault codes and perform system tests.
- Inspect the TCS control module, ABS system, wheel speed sensors, and wiring for any visible damage or signs of malfunction.
- Repair or replace any faulty components identified during the diagnostic process, such as the TCS control module, ABS pump, wheel speed sensors, or wiring harness.
- Clear the fault codes from the PCM memory and reset the TCS system to ensure proper functionality.
- Perform a road test to verify that the TCS is no longer inhibited and that the system is operating correctly.
Cost to Fix C1278 GMC
The cost of repairing a TCS temporarily inhibited by PCM code can vary depending on the specific cause of the issue and the extent of the repairs needed. On average, the cost of parts for this repair can range from $200 to $800, while labor costs can range from $100 to $300. Overall, the total repair cost for this issue may fall between $300 and $1100. It's important to note that these are rough estimates, and actual costs may vary based on factors such as location, vehicle make and model, and the shop's labor rates. It's recommended to consult with a professional mechanic for a more accurate cost estimate based on your specific situation.
Need more information about the C1278 GMC code?
Need more information on how to fix the C1278 GMC code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the C1278 GMC code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about C1278 GMC Code
1. What are the common symptoms of OBDII code C1278 GMC indicating TCS temporarily inhibited by PCM?
The common symptoms include the traction control system (TCS) light being illuminated on the dashboard, loss of traction control functionality, and potential issues with the vehicle's stability control system.
2. What does it mean when the TCS is temporarily inhibited by the PCM in a GMC vehicle?
When the TCS is temporarily inhibited by the powertrain control module (PCM), it usually indicates a fault or issue with the traction control system that needs to be addressed to ensure proper vehicle safety and performance.
3. What are the possible causes of OBDII code C1278 GMC related to TCS inhibition by the PCM?
Possible causes include faulty wheel speed sensors, damaged wiring or connectors in the TCS system, issues with the ABS modulator, or a malfunctioning PCM.
4. How can I diagnose the issue causing OBDII code C1278 GMC on my GMC vehicle?
Diagnosis typically involves using a diagnostic scanner to retrieve the trouble codes, conducting a visual inspection of the TCS components, and testing the wheel speed sensors and related wiring for faults.
5. Can driving with OBDII code C1278 GMC posing TCS inhibition be dangerous?
Driving with the TCS temporarily inhibited can impact the vehicle's stability and traction control, potentially leading to reduced handling and safety on slippery or uneven road surfaces. It is recommended to address the issue promptly.
6. What are the recommended repair tips for resolving OBDII code C1278 GMC related to TCS inhibition?
Repair tips may include replacing faulty wheel speed sensors, repairing damaged wiring, ensuring proper connection of TCS components, and performing a PCM reset or reprogramming if necessary.
7. Is it possible to reset OBDII code C1278 GMC indicating TCS inhibition without fixing the underlying issue?
While clearing the trouble code may temporarily turn off the warning light, it is crucial to address the root cause of the problem to ensure the TCS functions correctly and maintain vehicle safety.
8. Can a DIY enthusiast fix OBDII code C1278 GMC associated with TCS temporarily inhibited by PCM?
Depending on the underlying cause, DIY enthusiasts with automotive repair experience may be able to address the issue by following repair guides, utilizing proper tools, and conducting thorough diagnostic procedures.
9. How much does it typically cost to repair OBDII code C1278 GMC related to TCS inhibition in a GMC vehicle?
The cost of repair can vary based on the specific issue causing the trouble code, the labor rates of the repair shop, and the cost of replacement parts. It is recommended to obtain estimates from reputable mechanics.
10. Are there any recalls or technical service bulletins related to OBDII code C1278 GMC concerning TCS inhibition by the PCM?
It is advisable to check with authorized GMC dealerships or visit the manufacturer's website to inquire about any recalls or technical service bulletins related to OBDII code C1278 GMC and TCS issues in specific vehicle models.
Discuss the causes and fixes for C1278 GMC OBDII Code
Code C1278 GMC comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.